Cuando realizamos imagen de síntesis podemos perseguir que las imágenes parezcan reales o se asemejen a los clásicos dibujos animados (Cartoon). En el primer caso, simular el comportamiento de la luz obliga a usar elaboradas técnicas de renderizado y a elegir los materiales de nuestros objetos con sumo detalle.
Uno de los efectos que podemos simular es la desviación de la luz al atravesar superfícies semiopacas, como la piel de los personajes. Surfaces are allowed to spend a portion of light that illuminates the interior, but on his journey constantly changes direction upon impact with the molecules of the object. The technique that simulates this effect is called “Scattering”.
The Rayleigh scattering (en honor a Lord Rayleigh) is light scattering or other electromagnetic radiation particles much smaller than the Longitude de onda of the photons dispersed. It occurs when light travels through transparent solids and liquids, but is seen more frequently in gases. Rayleigh scattering of sunlight into the atmosphere the main reason is that the sky distinguish blue.
While the term dispersion is widespread in the scientific literature (together with the anglicized scattering, is often untranslated texts in Spanish), the term recommended by the Royal Academy of Sciences, Physical and Natural this is spreading, recommending the use of dispersion to scattering of light in various colors that make up the spectrum.(W)
Blender provides a function to simulate this effect.
To perform the calculations taking into account this phenomenon, divides in two steps:
- First calculate the brightness of the surface from two points of view, from the front and the rear of the object
- In eol second step replaces the “shader” scattered light for rendering, with the components obtained in the previous step, according to the parameters we have indicated in the effect control box,
The menu allows you to define these functions is in the tab material object. We will activate and choose from preset patterns or define your own parameters. In a new article will discuss these parameters in detail, but before we see some examples that are defined in version 2.6.
In physics called dispersion to the phenomenon separation of the waves different frequency passing through a material. All media materials are more or less dispersive, and the dispersion affects all waves; for example, to Sound waves moving through atmosphere, to radio waves traversing the space or to interstellar light traversing the water, the glass or air.(W)